Q: What is the approximate composition of silicon dioxide (SiO₂) present in ordinary Portland cement ? साधारण पोर्टलैण्ड सीमेंट में मौजूद सिलिकॉन डाइ-ऑक्साइड (SiO₂) की लगभग मात्रा कितनी होती है ?
A.
60-67%
B.
17-25%
C.
40-50%
D.
3-8%
Correct Answer:
Option B -
Explanations:
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